Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a14a85d2b55663…

MALICIOUS

PDF

54.9 KB Created: 2020-09-09 19:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1629b972616f5b9907f26820b7b8bfe0 SHA-1: b2b45a39e5de6f60286b3715bbef9fe419ddca12 SHA-256: 85a14a85d2b5566390723ad25b2161e66a56c0009806a6a5f623575cb7cdbadc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one identified as a malicious redirector, disguised as educational content. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to attract traffic and potentially deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/wix?keyword=english+grammar+worksheets+for+grade+4+cbse
    • http://sugej.innerbalancebermuda.com/uploads/1/3/0/7/130740051/4ea43f4.pdf
    • http://govamam.interdynartis.com/uploads/1/3/1/4/131437502/xepeduwipo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0451/1626/0517/files/71786664921.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/hayward_vari-_flo_xl_valve_parts.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3224/files/49974119521.pdf
    • https://static.usrfiles.com/ugd/50c35f_1d9b0c2e72664dc48d4a008f08fc7dab.pdf
    • https://static.usrfiles.com/ugd/0e2875_4916baec91a441988c184400579ca1c5.pdf
    • https://static.usrfiles.com/ugd/e5412a_1297466b2ee54bedb11ac300f96de6bf.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_cb9b06cc9d0748cbb5afcf368a8e879f.pdf
    • https://static.usrfiles.com/ugd/7008f3_704b720099e64965bbe5c5a2cd7067fb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b6c.bin
d23675aa3226d85da589e8595d2b5f1d1d93c45ca942a8c74eec30aa90e60787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6C 5564 bytes
font_01_sfnt_off00006e36.bin
18ce016d7c06f5ac46f1ed2c225a7a82f9825d776c2f92779c3394dd2d972fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E36 7536 bytes
font_02_sfnt_off00008398.bin
afb2669c9e197405d1417b636de9119763685525cd10cbfcd2a5aa647f28a409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8398 10112 bytes
font_03_sfnt_off0000a659.bin
e6236245b1b519c90993a0a0decb83651aa70bd3eb3f1615240c4a875e4479e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA659 17492 bytes
font_04_sfnt_off0000bfac.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAC 4324 bytes

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